Typewriting machine with covering hood



M ami; 14, 1944. wuNDERLlCH I 2,344,118

IYPEWRITING MACHINE WITH COVERING HOOD Filed Jan. 28, 1941 4 Sheets-Sheet 1 venivr: I

nya 94/04 March 14, 1944. F. WUNDERLICH v 8 I TYPEWRI IING MACHINE WITH COIERING HOOD Filed Jan. 28, 1941 4 Sheets-Sheet 2 March 14, 1944- F. WUNDERLICH 2,344,118

TYPEWRITING MACHINE WITH COVERING HOOD Filed Jan. 28,- 1941 4 Sheets-Sheet s March 14 1944. F; WUNDERLICH 2,344,118

TYPEWRITING MACHINE WITH COVERING HOOD Fild Jan. 28, 1941 4 Sheets-Sheet 4 Ir) Pentbr: IVWaQr/z 64 Patented Mar. 14, 1944 TYPEWRITIN G MACHINE WIT H COVERING- V HOOD Friedrich Wunderlich, Nuremberg, Germany;

vested in the .Alien Property Custodian Application January 28, 1941, Serial No. 376,398

Germany March 12, 1940 6 Claims. (01. 197-186) It has already become knownin typewriting machines to cover by a hood the driving mechanism and the ink ribbon spools. The hood is oscillatably mounted on the machine frame so that it can be raised in order to render accessible the elements of the typewriting machine which are covered by the hood. The covering hood can be raised in the direction of the platen. The inconvenience consists, however, that at the raising of the covering hood it strikes, when the carriage is in certain positions, against projecting elements of the carriage, for instance against the return lever, whereby these elements and also the hood are damaged. .It has therefore been proposed, to prevent raising of the covering hood by a locking device as long as projecting parts of the carriage are above the hood.

This known arrangement possesses, however, the inconvenience that several manipulations are required for its attendance. If the locking device is in the locking position and if the locking bolt holding the covering hood in the locked position is unlocked by the actuation of a push-knob, the hood remains closed and, for instance after the carriage has been pulled out towards the left, the locking bolt has to be pulled back again. This is comparatively complicated and does not allow quick typing.

Further the known arrangements have the inconvenience that the hoods can be opened only by a limited angle which is almost always below 90. The accessibility to the elements under the hood is thereby rendered more dificult. The small opening formed by the raising of the hood according to the known arrangements is almost toonarrow for hanging the ink ribbon into the ink ribbon fork or for removing the same. In such coverings it is therefore necessary, to provide' in the upperpart of the hood a very deep recess, whereby evidently protection against getting dirty or dusty of the inner machine elements and especially of the type lever segment is not ensured.

All these inconveniences are overcome by the invention, in that a carriage controlled locking device controls the raising of the hood when this hood has already been somewhat opened after the pulling back of amanually controlled locking device. As the opening of the hood is effected by the action of a spring, the hood rises in the device according to the invention without any further manipulation directly after the pushkn'ob locking has been released, it the carriage is in a position in which the projectingelements of the carriage no longer prevent raising ofithe hood.

This is attained according to the invention in that the locking lever controlled by the carriage in known manner ispulled back only when an unimpeded raising of the hood is ensured.

In order to obtain in this arrangement a free access to the inner machine elementsand tomake as small as possible the recess for the passage of the type levers, the covering hood is oscillatably mounted on a lever hinged on the frame of the typewriting machine and having a guide slot, in which a lever engages which is mounted on the typewriting machine frame and also guided in a slotted guide fixed on the hood.

-Whn the locking device which holds the covering hood in the closed position is unlocked, first a parallel'movement of the hood takes place until the locking device prevents a further raising of the hood. This movement is only so great, that in spite of the partial raising of the hood the free movement of the carriage is not impeded.

If the locking device is automatically unlocked after the carriage has been pushed back, the hood opens completely, inthat it carriesout in the first portion of its further travel a parallel movement and in the last portion an oscillating movement. The hood can be closed by a simple 'pressure. The lever hinged on the frame of the typewriting machine and guided in the two'slot guides is under the action of a spring which effects the raising, whereas the locking device engages behind a projection of this lever. By this invention a very good accessibility of the elements be-- low the hood is attained. This is possible even if the hood is opened by a smaller angle'than has become known up to the present. Aseparate recess for the insertion and removal of the ink ribbonis also no longer necessary,'so that the recesses in the hood need only be very small. In this manner the screening of the inner elements, especially of the type lever segment, against getting dusty and dirty is attained almost completely. The provision of the slot guides permits further the obtention of any desired form of movement. For instance the hood can be lifted and atthe same time oscillated, or the, hood isf first oscillated and then lifted. v

The invention is illustrated by'way of example in the accompanying drawings, in which Fig. 1 showsthe hood in section and in closed state, 1

Fig. 2 is a section similar to Fig. 1 showing the hood in the position it assumes after the unlocking of thelocking device but'in locked state,

Fig. 3 is a section similar to Fig. l the hood being open,

Fig. 4 shows in section a hood in closed state with slotted guides,

Fig. 5 is a section similar to that shown in Fig. 4 and shows the hood after the unlocking of the locking device but in still locked state,

Fig. 6 is a section similar to Fig. 4 the hood being open,

Fig. 7 shows in elevation the locking lever controlled by the carriage in unlocked position,

Fig. 8 is a view similar to Fig. 7 but shows the locking lever in looking position,

Fig. 9 shows a detail of Figs. 7 and 8,

Fig. 10 shows the raised hood in front elevation,

Fig. 11 shows in section the hood with sliding guide in closed state,

Fig. 12 is a section similar to Fig. 11 and shows the hood in the position it assumes after unlocking of the locking device but in still locked state,

Fig. 13 is a section similar to Fig. 11 the hood being raised,

Fig. 14 shows the locking device according to Figs. 11 to 13.

In the several figures the carriage is desig nated by I, the platen by 2, the return lever for the carriage by 3, and the covering hood by 4.

As shown in Figs. 1 to 3, the covering hood 4 is mounted on bearing brackets 6 and I fixed by screws on either side of frame 5 of the typewrit ing machine. A twoarmed lever 9, I 0 is fixed at 8 on the hood 4, and controlled by a spring II. The arm ID of this lever has a projection I2 under which a locking lever I3 can engage. The shaft I5 of locking lever I3 is journalled at I4 in the machine frame 5. A roller I6 is eccentrically mounted on shaft I5 and adapted to roll on a bar I'I mounted on the carriage I.

A push knob I8 is provided in the machine frame 5 and acted upon by a spring I9 which engages behind a hook (Fig. 2) fixed on hood 4.

The device operates as follows:

The covering hood 4 is held in the closed position shown in Fig. l by the locking device I8, I9, 20. If then a pressure is exerted upon the push knob I8, the locking I9, 20 is unlocked. As long as the return lever 3 of the carriage or other projecting elements of the carriage are above the hood 4 and would prevent raising of the hood, the roller I 6 has run up the bar IT, as shown in Figs. 7 and 8, so that the locking lever I3 is below the projection I2 of lever II), as shown in Fig. 2, and thereby prevents a further raising of hood 4 under the action of spring II. If the carriage is brought into the position shown in Fig. 7, and in Fig. 9 in dash dot lines, the locking lever I3 liberates the projection I2 and the spring II effects the complete raising of hood 4, as shown in Fig. 3.

In the device illustrated in Figs. 4 to 6 and 10, the covering hood 4 is mounted at 2! on the outer hinge levers 22 which are pivotally mounted in bearing bodies 24 fixed on either side of the machine frame 5. The outer hinge levers 22 have slots 23. The inner hinge levers 26 are oscillatably mounted at 25 on the bearing bodies 24 and controlled by opening springs II. Each hinge lever 26 has a pin 21 whichengages in the slot 23 of the corresponding outer hinge lever 22 and can slide in this slot. The inner hinge levers 26 have further each a pin 28 at its end which can slide in a corresponding longitudinal slot 29 of a control bar 30 fixed on the hood. One of the inner hinge levers 26 has a projection 3| under which the locking lever I3 engages in the locking position, said lever being controlled by the action of a spring 32, as shown in Fig. 9.

This device operates as follows:

When the push knob I8 (Fig. 4) is depressed, the hood 4 is raised by the action of spring II into the positionshown in Fig. 5, as the locking lever I3 which bears against the projection 3| of lever 26 prevents further opening of the hood 4 until the roller I6 has run off the control bar I! of the carriage I. As can be seen from Fig. 5, the movement is at first a parallel movement owing to the slot guiding of the individual levers. As soon as the roller I6 has run off the control bar I], the locking device l3, 3| is unlocked and the hood can open completely. The hood then carries out in the form of construction shown at first a further parallel movement and finally rises at the end of this movement.

Figs. 6 and 10 show'clearly that by this raising an absolutely free access is ensured to the elements of the machine which are otherwise covered by the hood. Consequently, the hood 4 need have only a small recess 3301, (Fig. 10) so that an extensive covering of the inner mechanism of the typewriting machine is attained.

If another curved shape is given to the slot guides 23,, 29, any desired movements of the covering hood can be obtained. It is evidently immaterial, whether the locking lever I3 engages with one of the moving elements or on the hood itself.

In the device illustrated in Figs. 11 to 14, the covering hood 4 is mounted on the arm 33 of a slidable piece 34 by a pivot pin 35. The slidable piece 34 is guided on frame 5 of the typewriting machine in a guide 35 and controlled by a pull spring 31.. ,A lever 38 is further pivotally connected with the hood and has a locking projection 39. This lever .38 is controlled by the action of .a pull spring .40. In the locked state a nose 4| .of the locking lever I3 engages over the projection 39, said locking lever being otherwise constructed in .amanner similar to that shown in the above described figures. The lever 38 is guided in the first portion of its movement by means of a pin 43 on a plate 42 against which (III it is pressed by the act-ion of the spring 40. The plate 42 has on its upper portion a curved path 44 along which the pin 43 slides after the lever 38 has been sufiiciently lifted.

The device operates as follows:

After unlocking the locking device l8, I8, 20, the hood 4 is lifted by the action of spring 31 until nose M of the locking lever I3 strikes against nose 38 of the oscillatable lever I3, as shown in Fig. 12. If then in accordance with the position of the carriage I the roller I6 runs off bar I'l, the nose 4| oflever I3 slips off the nose 39 of lever 38, and by the action of spring 3'! the pivot pin 35 of the hood 4 is raised until pin 43 has reached the upper end of the guide plate 42 and then carries out an oscillating movement along the curved path 44 under the action of spring 40. Owing to the rigid connection with the hood 4, this hood is raised.

I claim:

1. In a typewriting machine, a carriage, an ink ribbon driving mechanism, a hood covering said mechanism and movable to raised position, means tending to move the hood to raised position, a holding device for retaining the hood in lowered position, and a locking device controlled by said carriage and constructed to prevent the hood from being raised more than a predetermined extent in certain positions of the carriage upon the release of said holding device.

2. A typewriting machine as claimed in claim 1 characterized by the provision of a slidable element on the typewriter frame, and means pivotally connecting said element with said hood whereby upon said hood being raised, the pivotal connection thereof with the element is moved 10 upwardly;

3. A typewriting machine as claimed in claim 1 characterized by the provision of a slidable bar to which said hood is pivoted, a pull spring acting on said bar, a guide plate for said bar, a lever connected with said hood, a pull spring connecting said lever with said bar and means for guiding movement of said lever.

4. A typewriting machine as claimed in claim 1 characterized by the provision of a slotted guide on said hood, a lever pivotally mounted on the typewriter frame and having a guide slot, a second lever engaging the guide slot of the first lever and pivotally connected with said frame, and means on said second lever engaging the slot of said guide.

5. A typewriting machine asclaimed in claim 1 characterized by the provision of a slotted guide on said hood, a lever pivotally mounted on the typewriter frame and having a guide slot, a second lever engaging the guide slot of the first lever and pivotally connected with said frame, and means on said second lever engaging the slot of said guide, said means tending to move the hood to raised position coacting with the second mentioned lever.

6. A typewriting machine as claimed in claim 1 characterized by the provision of a slotted guide on said hood, a lever pivotally mounted on the typewriter frame and having a guide slot, a second lever engaging the guide slot of the first lever and pivotally connected 'with said frame, and means on said second lever engaging the slot of said guide, said means tending to move the hood to raised position coacting with the second mentioned lever, and the second mentioned lever including means coacting with said locking device.

FRIEDRICH WUNDERLICH. 

